Use the arropw keys to jump. No level is impossible, I have done all of them at least once! There are 40 levels and I will make more. You might have to click the green flag twice. Beginners: to wall jump, hold down the up and right arrow. Don't jump on anything outlined in red!
I never actually planned on making a second platformer, but I really had this idea in mind. All art and coding - @ginny_the_cat